confusing qr

[yahoogoogle]

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A store currently charges the same
price for each towel that it sells. If the
current price of each towel were to be
increased by $1, 10 fewer of the
towels could be bought for $120,
excluding sales tax. What is the
current price of each towel?


answer: 3

don't quite understand the question

 

[dentz]

Let the current price for each towel = x
# of towels sold for $120 at the price of x: y = 120/x
# of towels sold for $120 at the price of x+1: y = 120/(x+1)

thus, 120/x = 120/(x+1) + 10
120x + 120 = 120x + 10xsqr + 10x
n then u solve for x to get -4 or 3

so your ans is 3